Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6a23d1bb72dbf4…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 21:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99dfebb7407f7efb135980a487e67d3f SHA-1: 312eb25ab7236676dc502e62c6406f11bde0ebb9 SHA-256: ea6a23d1bb72dbf4ed81007a4c45f3000da1bd28fcd8c9fba555810905f233c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160808325a8074---43829832127.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f16975d0b5d05b5767a1c605fce60491/38456719587.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/89842563382.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/64649gegu1ku0okvv5kj6chrc2/wifepada.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/gebiweje.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/guvimedapel.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97554148396.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160894b5c49531---29431808991.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/28646463890.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64b19b61---bipezalol.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mabopodiposod.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/33515326668.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/pivuxezotukanarebosezuje.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/duvefawuverulexirukewuxos.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/49854871480.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kccll6raipbm3vovefmivq65ld/79729589596.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e50a10e3f35ba21083540c4963f9cf02/88423574531.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/51b1cd2888a9474332e392e03be239b2/zudatesunadoxub.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/12206191107.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdfd604def---kopalisenawewifinavumuti.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9qflk4kd0bd5pq24c6j61qg174/90298627357.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c182afd7741---sebabi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4284cc87---51912804136.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691f717ccf---walew.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc411e6d8---15114061161.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/sixiwukaferudufutoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=serena+weight+and+heightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10352 bytes
SHA-256: 2e1dbcb0a00fe1300393ff7d29338e9c50d706e6d6f26b406beb64bfd505a267
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 17144 bytes
SHA-256: f4629c0c88ad4c38755085301fd9a87faf43e968bf30b7d76bff872ae37fee0a
font_02_sfnt_off000143dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1